install dvips config files in dvips.d; no module installs such files, only texlive-core for now, but better safe than sorry if this happens after dvips config files handling has been switched to texmf-update

dont try to be too clever with TEXMFSYSVAR, it should not be modified, install paths should definitely not be dependant on tex configuration and consistent among themselves; thus hardcode default path for TEXMFSYSVAR

This form allows you to request diffs between any two revisions of this file.
For each of the two "sides" of the diff,
select a symbolic revision name using the selection box, or choose
'Use Text Field' and enter a numeric revision.